package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && " + "@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){
    }

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行数据填充.......");
//        获取当前被拦截方法上的数据库操作类型
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();//获取方法签名
        AutoFill autoFill = methodSignature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型

//        获取到当前方法参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object object = args[0];//当前方法参数，就是实体对象,我们默认第一个
//        准备被赋值的对象
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

//        根据不同的类型对象，为对象的对应的属性赋值（通过反射）
        if (operationType == OperationType.INSERT){
            try {
                Method setCreateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
//                通过反射机制来赋值
                setCreateTime.invoke(object, now);
                setCreateUser.invoke(object, currentId);
                setUpdateTime.invoke(object, now);
                setUpdateUser.invoke(object, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if (operationType == OperationType.UPDATE){
            try {
                Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
//                通过反射机制来赋值
                setUpdateTime.invoke(object, now);
                setUpdateUser.invoke(object, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
